About part numbers.... don't all you guys have the Mercedes Electronic Parts Catalog, aka the EPC? It's what the dealers use to look up part numbers, an electronic microfiche on two CD-ROM's (installs to your hard drive). They used to be all over eBay (bootleg copies on CD-R) but there are none now (hmmm, that's odd). I couldn't live without it.
It has prices too. Most recent "public" version I know of is August 2002, which is what I'm running...